ISMRM & ISMRT Annual Meeting & Exhibition • 03-08 June 2023 • Toronto, ON, Canada
Booth # | |||
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5252. |
A Hardware Approach to Automatic Phase Correction in
Receive-only Frequency Translation
Jue Hou1,
Madavan Raja Viswanath1,
Courtney Bauer1,
Mary P. McDougall1,2,
and Steven M. Wright1,2
1Electrical and Computer Engineering, Texas A&M University, College Station, TX, United States, 2Biomedical Engineering, Texas A&M University, College station, TX, United States Keywords: RF Arrays & Systems, System Imperfections: Measurement & Correction Frequency translation has been demonstrated to enable X-nuclear array coils on systems with only narrow-band 1H receivers. Mixing on receive only is preferred given the SAR monitoring on the transmit side, but requires additional phase correction to perform signal averaging. A post-processing phase correction method has been previously introduced by our group using the signals coupled from the local oscillators (LO) on the host system and translator. To avoid any post-processing and improve scanner throughput, we implement this correction method with hardware to detect and compensate the phase shift during the scan, which allows the signal averaging on the scanner. |
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5253. |
Enhancing, Manipulating or Canceling Magnetic Fields in the
Distance via Meta Materials for B0-Shimming in Brain MR Imaging
Lukas Hingerl1,
Bernhard Strasser1,
Gilbert Hangel2,3,
Stanislav Motyka1,
Fabian Niess1,
Eva Niess1,
Alexandra Lipka1,
Dario Goranovic1,
Philipp Lazen1,
Stephan Gruber2,
Siegfried Trattnig2,4,
and Wolfgang Bogner1
1Department of Biomedical Imaging and Image-guided Therapy, Radiology and Nuclear Medicine, Medical University of Vienna, HFMR Centre, Vienna, Austria, 2HFMR Centre, Vienna, Austria, 3Department of Neurosurgery, Medical University of Vienna, Vienna, Austria, 4Institute for Clinical Molecular MRI in Musculoskeletal System, Karl Landsteiner Society, Vienna, Austria Keywords: Shims, Magnets (B0) Metamaterials enabling magnetic replicators for $$$B_0$$$ shimming as well as for transcranial magnetic stimulation may overcome traditional methods especially concerning locality of field manipulation, field enhancement or cancellation in the distance in real-time by current tuning. |
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